/*+
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* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0""+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description:  Define CCalcHistory class. This class is handled historical +
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*                line of the calculator. +
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*+
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*/+
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+
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// INCLUDE FILES+
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#include "CalcEditline.h" +
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#include "CalcHistory.h" +
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+
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//  LOCAL CONSTANTS AND MACROS  +
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+
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+
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// ================= MEMBER FUNCTIONS =======================+
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+
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// C++ default constructor can NOT contain any code, that+
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// might leave.+
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//+
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CCalcHistory::CCalcHistory():+
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              iNewestIndex(KCalcMaxHistoryLines - 1)+
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    {+
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    iHistory[iNewestIndex].AllClear();+
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    }+
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+
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// Destructor+
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CCalcHistory::~CCalcHistory()+
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    {+
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    }+
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+
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+
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+
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// Assignment operator+
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// This inplementation depends on how to have history data. +
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// Refer to description of member data, CCalcHistory.h +
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// +
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const TCalcEditLine& CCalcHistory::operator[]+
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                       (TInt aIndex) // Get (aIndex + 1)th latest history line +
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    {+
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    TInt lineIndex(iNewestIndex - aIndex);+
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    +
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    if ( lineIndex < 0 )+
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        {+
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        lineIndex += KCalcMaxHistoryLines;+
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        }+
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        +
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    return iHistory[lineIndex];      +
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    }+
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+
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// ---------------------------------------------------------+
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// CCalcHistory::Count+
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// Return count of histoical lines.+
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// (other items were commented in a header).+
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// ---------------------------------------------------------+
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//+
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TInt CCalcHistory::Count() const     +
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    {+
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    return iCount;+
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    }+
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+
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// ---------------------------------------------------------+
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// CCalcHistory::Add+
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// This inplementation depends on how to have history data. +
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// Refer to description of member data, CCalcHistory.h +
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// (other items were commented in a header).+
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// ---------------------------------------------------------+
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//+
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void CCalcHistory::Add+
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                (const TCalcEditLine aLine) +
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    {+
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    if ( iNewestIndex == (KCalcMaxHistoryLines - 1) )+
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        {+
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        iNewestIndex = 0;+
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        }+
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    else+
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        {+
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        iNewestIndex++;+
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        }+
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    +
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    if ( iCount < KCalcMaxHistoryLines )+
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        {+
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        iCount++;+
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        }+
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    +
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    iHistory[iNewestIndex] = aLine;+
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    }+
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+
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// ---------------------------------------------------------+
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// CCalcHistory::ClearHistory+
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// Clear calculation history.+
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// (other items were commented in a header).+
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// ---------------------------------------------------------+
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//+
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void CCalcHistory::ClearHistory()+
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    {+
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    iCount = 0;+
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    iNewestIndex = KCalcMaxHistoryLines - 1;+
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    for (TInt cnt(0); cnt < KCalcMaxHistoryLines; cnt++)+
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        {+
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        iHistory[cnt].AllClear();+
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        }+
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    }+
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+
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+
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// ---------------------------------------------------------+
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// CCalcHistory::NotifyChangeDecimal+
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// Call when decimal separator is changed.+
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// (other items were commented in a header).+
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// ---------------------------------------------------------+
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//+
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void CCalcHistory::NotifyChangeDecimal(TChar aOld, TChar aNew)+
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    {+
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    for (TInt cnt(0); cnt < iCount; cnt++)+
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        {+
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        iHistory[cnt].ChangeDecimal(aOld, aNew);+
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        }+
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    }+
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        +
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+
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+
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// End of File+
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